PTFE is known to be the best dielectric for RF (Radio frequency) coaxial cables. The essential function of coaxial cables is to transmit high frequency energy and signals with low loss, with reflection less matching and without Phase and Amplitude distortion.

The problem in high-energy transmission is the losses because of i) cable dielectric, ii) cable construction, iii) radiation, and iv) interference with adjoining circuits.
The coaxial cable construction has been invented to overcome these problems, in which signals and energy are contained within an enclosed space. It consists of a core conductor, surrounded by pure PTFE dielectric covered with a metal shield, and finally encased in an overall jacket. The shield provides the return path as well as the confinement for RF energy, and is generally grounded.

TECHNICAL PARAMETERS OF RG COAXIAL CABLES WITH PTFE DIELECTRIC.

RG
Cable

Characteristic
Impedance

Core Conductor
(mm)

Core Dia
(mm)

Shield

Outer Dia
(mm)

Continuous Working Voltage

Max Operating Frequency

Operating Temperature

Nominal Capacitance
(pf/mtr)

Attenuation at 400 MHz DB/ 100m (Max)

196
A/U

50 Ohm

7 / 0.10
SPCW

0.863
PTFE

1SPC Braid

1.800
PTFE

750 VRMS

3 GHz

Cryogenic
to 200°C

95.0

103.00

188
A/U

50 Ohm

7 / 0.17 SPCW

1.524
PTFE

1SPC Braid

2.490
PTFE

900 VRMS

3 GHz

Cryogenic
to 200°C

95.0

65.60

187
A/U

75 Ohm

7 / 0.10 SPCW

1.600
PTFE

1SPC Braid

2.540
PTFE

900 VRMS

3 GHz

Cryogenic
to 200°C

65.6

68.90

195
A/U

95 Ohm

7 / 0.10 SPCW

2.591
PTFE

1SPC Braid

3.580
PTFE

1100 VRMS

3 GHz

Cryogenic
to 200°C

52.5

55.80

142
B/U

50 Ohm

1 / 1.00 SPCW

2.946
PTFE

2 SPC Braid

4.950
PTFE

1400 VRMS

12 GHz

Cryogenic
to 200°C

93.5

29.50

141
A/U

50 Ohm

1 / 1.00 SPCW

2.946
PTFE

1SPC Braid

4.830
VFG-1

1400 VRMS

3 GHz

Cryogenic
to 200°C

93.5

29.50

115
A/U

50 Ohm

7 / 0.71
SPC

6.350
PTFE

2SPC Braid

9.530
VFG-3

3700 VRMS

12 GHz

Cryogenic
to 200°C

93.5

17.10

PTFE SLEEVES

PTFE sleeves are made by tape wrapping and sintering process as per JSS and other specifications.
PTFE sleeves/ tubings find there application in various sectors such as :-

Defence,space, aerospace, radars etc.

Electronic communication and controls equipments.

Insulation over electrical joints wherever connections are likely to be heated.

To cover lead wires coming out of equipments.

In Switchgears.

To cover and protect hot joints in proximity with chemicals

PTFE sleeves are made available in various bore sizes ranging from 0.50 mm to 25.00 mm in different wall thicknesses. Common wall thicknesses are 0.25 mm, 0.30 mm, 0.40 mm and0.50 mm.
PTFE sleeves are available in 11 solid colours and various combinations in bi-colour and tri-colour as per requirement.